or

为 $or 条件指定参数；

//member = ["zhangsan", "lisi", "wangwu"];let filter = {  $or: [    {docKey: "public"},    {owner: "zhangsan"},    {member: "lisi"}  ]}db.getCollection('docs').find(filter);
  1. 数据筛选or是或查问
  2. 满足上面的条件其中之一就能够查问出相干数据
  3. 如果数据库参数是数组，间接会从数组外面匹配是否蕴含相干数据 如上：member

and

为 $and 条件指定参数；

let filter = {  $and: [    {docKey: "public"},    {owner: "zhangsan"}  ]}db.getCollection('docs').find(filter);

直译：

docKey == "public" && owner == "zhangsan"

须要满足枚举的两个条件能力筛选出相应数据；

and与or联结应用

let filter = {  $or: [          {              docKey: "public"          },          {              $and: [{docKey: "private"}, {$or:[{member: "zhangsan"}, {owner: "lisi"}]}]          }      ]}db.getCollection('docs').find(filter);

直译：

docKey == "public" || (docKey == "private" && (member.indexOf("zhangsan")>-1 || owner=="lisi"))

where

let filter = {  $or: [          {              docKey: "public"          },          {              $where: function(){                return this.docKey == "private" && (this.member.indexOf("zhangsan") > -1 || this.owner == "lisi");              }          }      ]}db.getCollection('docs').find(filter);

直译：

docKey == "public" || (docKey == "private" && (member.indexOf("zhangsan")>-1 || owner=="lisi"))

或者如下的写法

let filter = {  $or: [          {              docKey: "public"          },          {              $where: `this.docKey == "private" && (this.member.indexOf("zhangsan") > -1 || this.owner == "lisi")`          }      ]}db.getCollection('docs').find(filter);